Is it really risky to sell old mobile phones?

For example, after the phone is restored to factory settings, some information inside, such as address book, including some photos, and some apps you usually download are gone. I think some things in my mobile phone have been cleaned up after they have been restored to factory settings.

So can restoring factory settings really completely erase all records? Wang Wen, a mobile phone engineer who has been engaged in mobile phone maintenance for many years, told reporters that in fact, the storage method of mobile phones is the same as that of computers, and the information deleted on the surface has not really been deleted. As long as you use some specific software, the deleted data can be recovered twice.

Wang Wen, a mobile phone maintenance engineer: There is a data recovery software that we can download online. There is a tutorial on it, which is very simple, but it may be more complicated for non-professionals.

Subsequently, the reporter logged into an online mall, entered "mobile phone information recovery" and immediately jumped out of various data recovery services, with prices ranging from 10 yuan to 500 yuan.

Taobao seller: Although the mobile phone recovery software we sell can't recover all personal information, it can guarantee to retrieve the short messages deleted a week ago.

Since the deleted information can be recovered, does it mean that the information in the mobile phone cannot be completely deleted? The reporter learned that general mobile phone repair shops have software to quickly and completely delete mobile phone information. If you want to permanently delete some information, you can use these softwares to process the mobile phone, or you can ask professional technicians for help.

Wang Wen, mobile phone maintenance engineer: You can connect your mobile phone to the computer first, and then format it. You can't get it back after formatting. Or after returning to the factory, write new data and overwrite the old data. In addition, you can find a professional mobile phone maintenance engineer to transfer the personal information in your mobile phone.